That may be -- and possibly you can remove inserts to make skips in the pattern.
Umm ... where did you find non-conductive aluminum? At best, the very thin layer of oxide on the surface is non-conductive, until you get to a high enough voltage. And an anodized surface is also non-conductive -- again until you get to a high enough voltage. Past that, it conducts very well. I've had a 240 VAC difference break down the anodize coating on a chassis thanks to a mis-wiring.
And remember -- aluminum house wiring was used for a period, until it started starting fires as the wiring aged. So yes, aluminum conducts quite well.
For that matter -- the leads from the meter to the breaker box in this house are aluminum, so if it were non-conductive, I would not be able to run the computer on which I am typing this, and would be sitting here in the dark.
Even a very thick anodize on aluminum would not protect against the voltages present in a thunderstorm. Forget that theory.
Enjoy, DoN.